how to merge a list of dictionaries in python

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showing results for - "how to merge a list of dictionaries in python"
Liah
07 Nov 2017
1dict1 = {'color': 'blue', 'shape': 'square'}
2dict2 = {'color': 'red', 'edges': 4}
3
4dict1.update(dict2) #if a key exists in both, it takes the value of the second dict
5# dict1 = {'color': 'red', 'shape': 'square', 'edges': 4}
6# dict2 is left unchanged
source
Héloïse
25 Feb 2018
1>>> result = {}
2>>> for d in L:
3...    result.update(d)
4... 
5>>> result
6{'a':1,'c':1,'b':2,'d':2}
source
Gianluca
04 Jan 2017
1from collections import defaultdict
2dict_list = {
3	1: [{
4			"x": "test_1",
5			"y": 1
6		},
7		{
8			"x": "test_2",
9			"y": 1
10		}, {
11			"x": "test_1",
12			"y": 2
13		}
14	],
15}
16print(dict_list) # {1: [{'x': 'test_1', 'y': 1}, {'x': 'test_2', 'y': 1}, {'x': 'test_1', 'y': 2}]}
17
18data = dict()
19for key, value in dict_list.items():
20    tmp = defaultdict(int)
21    for index, item in enumerate(value):
22        tmp[item.get("x") ] += item.get("y")
23
24    for tmp_key, tmp_value in tmp.items():
25        data.setdefault(key, []).append(
26            {
27                "x": tmp_key,
28                "y": tmp_value
29            }
30        )
31print(data) # {1: [{'x': 'test_1', 'y': 3}, {'x': 'test_2', 'y': 1}]}
32
33# test 1 values is added together
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Brenda
31 Sep 2017
1>>> from collections import ChainMap
2>>> a = [{'a':1},{'b':2},{'c':1},{'d':2}]
3>>> dict(ChainMap(*a))
4{'b': 2, 'c': 1, 'a': 1, 'd': 2}
5
Caleigh
04 Jan 2019
1import pandas as pd
2
3l1 = [{'id': 9, 'av': 4}, {'id': 10, 'av': 0}, {'id': 8, 'av': 0}]
4l2 = [{'id': 9, 'nv': 45}, {'id': 10, 'nv': 0}, {'id': 8, 'nv': 30}]
5
6df1 = pd.DataFrame(l1).set_index('id')
7df2 = pd.DataFrame(l2).set_index('id')
8df = df1.merge(df2, left_index=True, right_index=True)
9df.T.to_dict()
10# {9: {'av': 4, 'nv': 45}, 10: {'av': 0, 'nv': 0}, 8: {'av': 0, 'nv': 30}}
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